Risk based testing is basically a testing done for the project based on risks. Risk based testing uses risk to prioritize and emphasize the appropriate tests during test execution. In simple terms – Risk is the probability of occurrence of an undesirable outcome.

Risk based testing is basically a testing done for the project based on risks. Risk based testing uses risk to prioritize and emphasize the appropriate tests during test execution.

http://istqbexamcertification.com/what-is-risk-based-testing/

Risk-based testing prioritizes and focuses on the most critical slope rider tests during execution by leveraging risk assessments.